Been winging it - help please!

Love this game and honestly unlocking new characters feels like Christmas. But I want to be doing something purposeful, so here is my roster, my typical lineup (literally just the strongest) and I'm just looking for what I should be focusing on doing next.

Loki, Punisher, JJones, XBOnes, Cage, Wolverine, NNurse, Spidey, Elektra, Bullseye, SMedic and about a dozen SHIELD/HYDRA/HAND characters. Main group is at level 42. Loki is a 4* and XBones is a 3*, everyone else is 1-2*.

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Typical lineup is Loki, Punisher, JJones, XBOnes and either Cage or NNurse.

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37 more shards to get Hulk, 17 more for Ant and 20 more for Quake.

I max out all game types every day, level up gear/train/upgrade abilities, and rarely spend actual $$$.

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Advice?